Implement max HTLC sync functionality

[markettes]

Sets each managed node's advertised max_htlc_msat to MAX_HTLC_CAPACITY_RATIO (default 0.99) of channel capacity, reconciled per channel on every ChannelMonitorJob pass.

Covers all channel types (NodeGuard-created, detected, and pre-existing) since the job reconciles whatever ListChannels reports; writes echo the live base fee / fee rate / timelock and omit inbound fees, so the dynamic fee engine's values are left untouched.

[Copilot]

Pull request overview

Adds a reconciliation path that keeps each managed node’s per-channel advertised max_htlc_msat aligned to a configurable fraction of channel capacity, executed during ChannelMonitorJob passes. This extends NodeGuard’s channel monitoring loop with an additional LND policy update capability (implemented via an updated UpdateChannelPolicy request builder).

Changes:

• Introduces MaxHtlcSyncResult and ILightningService.SyncChannelMaxHtlc(...), including auditing and “no-op” detection when already at target.
• Extends ILightningClientService.SetChannelFeePolicy(...) to optionally set max_htlc_msat, and wires sync execution into ChannelMonitorJob.
• Adds MAX_HTLC_CAPACITY_RATIO constant + env override and comprehensive unit tests around max-HTLC target resolution and job behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/Services/LightningService.cs	Implements SyncChannelMaxHtlc, adds result enum, and integrates policy read/write + auditing.
src/Services/LightningClientService.cs	Extends SetChannelFeePolicy to optionally include MaxHtlcMsat in the LND policy update request.
src/Jobs/ChannelMonitorJob.cs	Calls max-HTLC reconciliation per channel, containing failures per-channel to avoid aborting the job.
src/Helpers/Constants.cs	Adds MAX_HTLC_CAPACITY_RATIO default and env-based configuration parsing.
test/NodeGuard.Tests/Services/LightningServiceTests.cs	Adds extensive test coverage for max-HTLC sync outcomes, bounds handling, and auditing behavior.
test/NodeGuard.Tests/Services/LightningClientServiceTests.cs	Updates tests for the new SetChannelFeePolicy signature (named client: arg).
test/NodeGuard.Tests/Jobs/ChannelMonitorJobTests.cs	Adds job-level tests verifying sync is called for each channel and failures are contained.

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[Jossec101]

LGTM, 0.99 its big imo but let's see